Pop safety-valve.



PATENTED JAN 16, 1906.

J. W. GRANT.

POP SAFETY VALVE.

APPLICATION FILED JUNE 5, 1905.

UNITED STATES PATENT OFFICE.

POP SAFETY-VALVE.

Specification of Letters .Patent.

Patented Jan. 16, 1906.

Application filed June 5,1905. Serial No. 263,822.

To all whom it may concern.-

Be it known that I, JORDAN W1NsLow GRANT, a citizen of the UnitedStates, residing at Portsmouth, in the county of Norfolk and State ofVirginia, have invented new and useful Improvements in PopSafety-Valves, of which the following is a specification.

This invention relates to pop safety-valves, and has for its principalobject to provide a novel construction of pop-valve in which theclosing-spring is protected from oxidation and the injurious effects ofhigh temperature by the employment of a spring-holder separate from thevalve-chamber.

A further object of the invention is to pro vide a device of this typein which the adjustment of the spring may be readily accomplishedinaccordance with the pressureto be carried without danger of injury tothe operator. 1

With these and other objects in view the invention-consists in the novelconstruction and arrangement of parts hereinafter described, illustratedin the accompanying drawings, and particularly pointed out in theappended claim, it being understood that various changes in the form andproportions of parts may be varied without departing from the invention.

In the accompanying drawings, Figure 1 is a vertical section of asafety-valve constructed in accordance with the invention. Fig. 2 is asectional plan view of the same on the line 2 2 of Fig. 1.

The valve and its spring are arranged within a pair of parallelcylindrical casings 10 and 11, that preferably are formed of an integralcasting and united by a web 12. The top of the web carries a. pair oflugs 13, between which is pivoted the central portion of a lever 14,having one arm connected to the valve and the other to the spring. Thecasing 11 is provided at its upper end with a threaded cover 11 and atits lower end with a threaded opening for the reception of anadjustingscrew 16, the upper end of which bears against the centralportion of a disk 17 within the casing. This disk receives the lower endof a helical compression-spring 18, and at the top of the latter is adisk 19, connected to the lower end of a short rod 20, the upper end ofwhich is pivotally connected to the lever 14.

The upper end of the casing 10 is provided with a perforated cover 10 toallow steam to escape from the cylinder, or the cylinder may be providedwith an opening on the side to allow the steam to escape.

The lower end of the casing 10 is internally threaded for the receptionof a removable valve-seat 21, having a wrench-engaging face 22 andterminating in a threaded portion 23, which is connected to the boileror a pipe leading therefrom.

The upper portion of the valve-seat 21 is reduced in diameter andthreaded for the reception of a detachable and adjustable huddling-ring24, which is provided with peripheral notches 25 for the reception of asetscrew 26, by which the huddling-ring may be locked in adjustedposition.

The valve-seat receives a valve 27, having the usual pendent wings 28.In the upper face of the valve is a recess 29 for the reception of thelower end of a valve-spindle 30, the upper end of which is pivotallyconnected to the lever 14.

It will be noted that the spring is wholly protected from the steam andcannot be injured by oxidation. It is furthermore so arranged thatadjustment may be readily accomplished without danger of injury fromescaping steam.

Should it become necessary to renew a broken or fatigued spring, thevalve may be locked in place and the lever detached, after which thespring-casing may be opened and the spring removed.

Having thus described the invention, what is claimed is A popsafety-valve, comprising a pair of integral parallel cylinders having aconnecting web and one constituting a valve-chamber and the other aspring-casing, a valve-seat secured within the lower portion of thechamber, a valve arranged on said seat, a perfo rated cap arranged atthe top of the casing and removable therefrom for repair or renewal ofthe valve, a loose valve-stem guided in a central opening in the cap andentering through a threaded opening at the bottom of acentrally-disposed recess in the Valve, a the casing and bearing onsaidlower disk. 10 compression-spring arranged in the casing, Intestimony whereof I afiiX my signature upper and lower disks at the endsof the in presence of two subscribing Witnesses. spring, a sternextending from the upper JORDAN WINSLOW GRANT. disk, a pivot-lug carriedby the Web, a lever Witnesses:

pivoted thereto and connected to said tWo A. PATRroK,

stems, and an adjustingscrew passing LoUIs GEBnBAoH.

